p^2-3
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The number is 3 less than the square root of 16 ie 3 less than 4, so it's 1.
3 is prime, 1 less than the perfect square of 4 (2x2)
9/5
26 5*5 and 3*3*3
there is no number less than 49 between 1 and 100 that if multiplied by 2 will have a 3-digit product no number less than 50, actually